用反相气相色谱法研究核壳型抗冲改性剂

Study of a core-shell type impact modifier by inverse gas chromatography.

作者信息

Santos J M R C A, Guthrie J T

机构信息

Department of Chemical Technology, School of Technology and Management, Polytechnic Institute of Bragança, Campus de Santa Apolónia, 5301-857 Bragança, Portugal.

出版信息

J Chromatogr A. 2005 Apr 8;1070(1-2):147-54. doi: 10.1016/j.chroma.2005.02.060.

DOI:10.1016/j.chroma.2005.02.060

PMID:15861798

Abstract

Inverse gas chromatography (IGC) has been used to study the Lewis acid-base properties of a technologically and commercially important core-shell type elastomer (MBS rubber). The parameters determined were the dispersive component of the surface tension, the surface free energy, the enthalpy and the entropy of adsorption of polar and apolar probes, the surface Lewis acidity constant (Ka), and the surface Lewis basicity constant (Kb). The results show that the MBS rubber is amphoteric but strongly Lewis basic. It is weakly Lewis acidic. The results are in accord with the analysis of the molecular structure of PMMA, the shell component of this impact modifier (IM). The interactivity of this elastomer with the remaining materials in multicomponent polymeric systems is expected to be strongly influenced by the particular surface energetic properties of the MBS rubber. The results presented would contribute to the interpretation, forecast and optimization of the adhesion properties and phase preferences shown by this impact modifier when incorporated in such complex polymeric systems as polymer blends and composites.

摘要

反相气相色谱法（IGC）已被用于研究一种在技术和商业上都很重要的核壳型弹性体（MBS橡胶）的路易斯酸碱性质。所测定的参数包括表面张力的分散成分、表面自由能、极性和非极性探针的吸附焓和熵、表面路易斯酸度常数（Ka）以及表面路易斯碱度常数（Kb）。结果表明，MBS橡胶是两性的，但具有很强的路易斯碱性，路易斯酸性较弱。这些结果与对该抗冲改性剂（IM）的壳组分聚甲基丙烯酸甲酯（PMMA）分子结构的分析一致。预计这种弹性体与多组分聚合物体系中其他材料的相互作用会受到MBS橡胶特定表面能性质的强烈影响。所呈现的结果将有助于解释、预测和优化这种抗冲改性剂在诸如聚合物共混物和复合材料等复杂聚合物体系中所表现出的粘附性能和相偏好。